Csillag&shy;túra

2025-01-25 Bad Ha Sky, Manual Culling

2025.01.25. admin

Borges, the blind librarian, helping out to manually cull the results, and select which frames, if any, go to stacking. The fog/haze helped, but the clouds… didn’t.

2025-01-25-0805 2-Sun-Ha 2025.01.25. disk 0 00 pipp lapl2 ap12291 reg1 ps4 mono

2025-01-25-0805 2-Sun-Ha 2025.01.25. disk 0 00 pipp lapl2 ap12291 reg1 ps4 color

manual culling

All the way to the corona

2025.01.14. admin

On 2025-01-12, I imaged the Sun in He I D3. Using my scripts to extract the weak signal, I got able to show features otherwise characteristic of the corona. I stacked a total of 72 scans, spanning between 2025-01-12-0741Z and 2025-01-12-0933Z. Basically, I imaged the fingerprint of the giant coronal hole.

Helium – don’t peek into secrets

2025.01.02. admin

The Helium I D3 line, unless one knows exactly what to look for, is elusive to put it mildly. Hence the secret. And the poet, Attila JÓZSEF warned us: a titkokat ne lesd meg. So let’s take the spectroheliograph and image the Sun ostinatamente. 78 scans went into this image on 2024-11-02.

The Sun on 2024-12-26

2024.12.26. admin

Nap spectrum

Today I caught some clear sky in the Ersatz-Obsi, so the spectroheliograph got to work. For the ImageMath scripts (JSol’Ex) see this previous post.

He I D3 concept

The Helium Sun on 2024-11-07

2024.11.08. admin

Using the spectroheliograph and the ~30nm wide sodium ERF filter, I imaged the Sun in the He I D3 spectral line. Recordings processed with JSol’Ex, and details enhanced by the script below. For the final images, about forty individual frames (reconstructed scans) were stacked.

Fun fact, the light triangle in the lower half of the image corresponds to a dark feature in the corona, as seen on the SDO AIA 211 image.

Walks on a nearby spectral region

2024.09.14. admin

kalcium K vonal Nap

The Sun on 2024-09-13, around the CaH line, also touching Hydrogen epsilon. Pixel shifts range from -36 pixels (blue wing) to +40 pixels (red wing), meaning somewhere around -2..+2 Å in total, give or take.

JSol’Ex stuff

2024.08.18. admin

english

Hydrogen Epsilon-Prime, extracted from the Epsilon-Raw and an adjacent context for continuum

Since Google is no longer our friend[1], thus finding the things we are looking for has become harder and harder[2], I decided to assemble a few things that help me tame JSol’Ex.

JSol’Ex Repo: https://github.com/melix/astro4j

JSol’Ex downloads: https://melix.github.io/astro4j/latest/en/jsolex.html

Help/Docs (at ImageMath): https://melix.github.io/astro4j/latest/fr/jsolex.html#imagemath

Extracting the Hydrogen Epsilon line, like it was He I D3, simple version (where, relative to CaH, epsilon is at +25px)

[outputs]

epsilon = min(range(23,27,1))

kontinuum2 = avg(range(14,18,1))

delta2 = fix_banding(epsilon – kontinuum2, 100, 50)

prime_stretched2 = linear_stretch(epsilon * delta2 + delta2)

prime_rot2 = rotate_rad(prime_stretched2, angleP)

A verbose and more complex version of the epsilon script:

The Sun in CaK, etalon+shg, on 2024-06-02

2024.07.08. admin

english kütyü saját asztrofotóim

kalcium K vonal Nap

I combined some spectroheliograph data with the etalon, Sol’Ex at 62/400 with Lunt CaK B1800 at 102/1100.

The Sun in Helium I D3, spectroheliograph adventures

2024.07.02. admin

The Sun in Helium D3, He I D3

This really feels like standing on the shoulders of giants. I got my Sol’Ex spectroheliograph, and started using it with INTI and JSol’Ex (links below). Long story short, while the Sol’Ex in the plastic feels like a toy, it bends, sags and kinks and twists and vibrates and all, I find it an excellent introduction, and beyond, to solargraphy and spectroscopy. The software? It blows my mind.